src/mainboard/lenovo/t60/smihandler.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include <device/pci_ops.h>
   5 #include <device/pci_def.h>
   6 #include <console/console.h>
   7 #include <cpu/x86/smm.h>
   8 #include <soc/nvs.h>
   9 #include <southbridge/intel/common/pmutil.h>
  10 #include <ec/acpi/ec.h>
  11 #include "dock.h"
  12 #include "smi.h"
  13
  14 #define GPE_EC_SCI      12
  15
  16 #define LVTMA_BL_MOD_LEVEL 0x7af9 /* ATI Radeon backlight level */
  17
  18 static void mainboard_smi_brightness_down(void)
  19 {
  20         uint32_t reg32 = pci_read_config32(PCI_DEV(1, 0, 0), PCI_BASE_ADDRESS_2) & ~0xf;
  21         u8 *bar = (void *)(uintptr_t)reg32;
  22
  23         /* Validate pointer before using it */
  24         if (!bar || smm_points_to_smram(bar, LVTMA_BL_MOD_LEVEL + sizeof(uint8_t)))
  25                 return;
  26
  27         printk(BIOS_DEBUG, "bar: %p, level %02X\n", bar, *(bar+LVTMA_BL_MOD_LEVEL));
  28         *(bar+LVTMA_BL_MOD_LEVEL) &= 0xf0;
  29         if (*(bar+LVTMA_BL_MOD_LEVEL) > 0x10)
  30                 *(bar+LVTMA_BL_MOD_LEVEL) -= 0x10;
  31 }
  32
  33 static void mainboard_smi_brightness_up(void)
  34 {
  35         uint32_t reg32 = pci_read_config32(PCI_DEV(1, 0, 0), PCI_BASE_ADDRESS_2) & ~0xf;
  36         u8 *bar = (void *)(uintptr_t)reg32;
  37
  38         /* Validate pointer before using it */
  39         if (!bar || smm_points_to_smram(bar, LVTMA_BL_MOD_LEVEL + sizeof(uint8_t)))
  40                 return;
  41
  42         printk(BIOS_DEBUG, "bar: %p, level %02X\n", bar, *(bar+LVTMA_BL_MOD_LEVEL));
  43         *(bar+LVTMA_BL_MOD_LEVEL) |= 0x0f;
  44         if (*(bar+LVTMA_BL_MOD_LEVEL) < 0xf0)
  45                 *(bar+LVTMA_BL_MOD_LEVEL) += 0x10;
  46 }
  47
  48 static void mainboard_smi_dock_connect(void)
  49 {
  50         /* If there's an legacy I/O module present, we're not
  51          * allowed to connect the Docking LPC Bus, as both Super I/O
  52          * chips are using 0x2e as base address.
  53          */
  54         if (legacy_io_present())
  55                 return;
  56
  57         if (!dock_connect()) {
  58                 /* set dock LED to indicate status */
  59                 ec_write(0x0c, 0x08);
  60                 ec_write(0x0c, 0x89);
  61         } else {
  62                 /* blink dock LED to indicate failure */
  63                 ec_write(0x0c, 0xc8);
  64                 ec_write(0x0c, 0x09);
  65         }
  66 }
  67
  68 static void mainboard_smi_dock_disconnect(void)
  69 {
  70         dock_disconnect();
  71         ec_write(0x0c, 0x09);
  72         ec_write(0x0c, 0x08);
  73 }
  74
  75 int mainboard_io_trap_handler(int smif)
  76 {
  77         switch (smif) {
  78         case SMI_DOCK_CONNECT:
  79                 mainboard_smi_dock_connect();
  80                 break;
  81
  82         case SMI_DOCK_DISCONNECT:
  83                 mainboard_smi_dock_disconnect();
  84                 break;
  85
  86         case SMI_BRIGHTNESS_UP:
  87                 mainboard_smi_brightness_up();
  88                 break;
  89
  90         case SMI_BRIGHTNESS_DOWN:
  91                 mainboard_smi_brightness_down();
  92                 break;
  93
  94         default:
  95                 return 0;
  96         }
  97
  98         /* On success, the IO Trap Handler returns 1
  99          * On failure, the IO Trap Handler returns a value != 1 */
 100         return 1;
 101 }
 102
 103 static void mainboard_smi_handle_ec_sci(void)
 104 {
 105         u8 status = inb(EC_SC);
 106         u8 event;
 107
 108         if (!(status & EC_SCI_EVT))
 109                 return;
 110
 111         event = ec_query();
 112         printk(BIOS_DEBUG, "EC event %#02x\n", event);
 113
 114         switch (event) {
 115         /* brightness up */
 116         case 0x14:
 117                 mainboard_smi_brightness_up();
 118                 break;
 119         /* brightness down */
 120         case 0x15:
 121                 mainboard_smi_brightness_down();
 122                 break;
 123         /* Fn-F9 Key */
 124         case 0x18:
 125         /* power loss */
 126         case 0x27:
 127         /* undock event */
 128         case 0x50:
 129                 mainboard_smi_dock_disconnect();
 130                 break;
 131         /* dock event */
 132         case 0x37:
 133                 mainboard_smi_dock_connect();
 134                 break;
 135         default:
 136                 break;
 137         }
 138 }
 139
 140 void mainboard_smi_gpi(u32 gpi)
 141 {
 142         if (gpi & (1 << GPE_EC_SCI))
 143                 mainboard_smi_handle_ec_sci();
 144 }
 145
 146 int mainboard_smi_apmc(u8 data)
 147 {
 148         switch (data) {
 149         case APM_CNT_ACPI_ENABLE:
 150                 /* use 0x1600/0x1604 to prevent races with userspace */
 151                 ec_set_ports(0x1604, 0x1600);
 152                 /* route H8SCI to SCI */
 153                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
 154                 break;
 155         case APM_CNT_ACPI_DISABLE:
 156                 /* we have to use port 0x62/0x66, as 0x1600/0x1604 doesn't
 157                    provide a EC query function */
 158                 ec_set_ports(0x66, 0x62);
 159                 /* route H8SCI# to SMI */
 160                 gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
 161                 break;
 162         default:
 163                 break;
 164         }
 165         return 0;
 166 }